Improvement in hot-air furnaces



W. W. DODGE.

Hot-Air Furnace.

Patented Aug. 27,1872.

: i I v ER f @ttm witmsz /y/ i UNITED STATES PATENT OFFICE.

WILMOT W. DODGE, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN HOT-AIR FU'RNACES.

Specification forming part of Letters Patent No. 130,847, dated August27, 1872.

Specification describing a new and useful Improvement in Hot-AirFurnaces, invented by WiLMoT W. DODGE, of Boston, in the county ofSuffolk and State of Massachusetts.

'This Ainvention relates to new and useful improvements in furnaces forheating buildings by hot air 5 and consists in the construction andarrangement of parts hereinafter described.

In the accompanying drawing, Figure l represents a vertical section ofthe improved furnace taken on the line av a: of Fig. 2. Fig. 2 is ahorizontal section of Fig. l taken on the line y y.

Similar letters of reference indicate corresponding parts. v

A representsthe fire-box. B is the surrounding casing. O are theair-tubes which pass through the casing at the bottom', as seen at D,and up through the cap of the casing, as seen at E, more or less innumber. These tubes are surrounded with the products of combustion inthe combustionchamber F above the re-box. By this'arrangement of theair-tubes the fuel is greatly economized. Gr is a horizontal partitionattached to the casing B, dividing the chamber outside the casing intotwo compartments, the upper being the hot-air chamber, and the lower thecold-air chamber. They are marked, respectively, H and I. J representsone or more dampers or valves in the partition G, which are adjusted sothat more or less cold air may be allowed to escape into the hot-airchamber and mingle With the hot air for regulating its temperature. Krepresents the walls of the furnace. L are the passages for thedistribution of the hot air to the different apartments of the dwelling.M is the escape-pipe for the smoke and unconsumed gases. N is thedoorway for the introduction of the fuel. O is the grate, and P is theash-pit. R is the pipe by which fresh air is introduced into thecold-air chamber I, and Q is a damper by which the quantity thereof maybe regulated.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent- 1. The hot-air chamber H and cold-air chamber I,separated bya partition, Gr, having dampers J, when applied to a hot-airfurnace, as and for the purpose set forth.

2.*The combination with subject-matter of first claim, of pipes Cpassing through the combustion-chamber F, as and for the purposedescribed.

WILMOT W. DODGE.

Witnesses: Y Y R. H. CORNWELL, OsBoRN D. OLIVER.

